Lotus Evora - Throttle Actuator Control Range;Performance

Lotus Service Notes Section EMR
Page 61
Throttle Actuator Control Range/Performance
P0638 Throttle actuator control range/performance
Description
The single throttle butterfly valve mounted at the inlet to the intake plenum is operated by a stepper motor under
the command of the engine ECU. The valve moves through a range of nearly 90° and should display 100% at
full throttle and around 2% at idle.
Monitor:
• Continuous
Enable Criteria 1:
• Enginerunning
Disable Criteria 1:
• ElectronicthrottlefaultP2135,P0122,P0122,P0222orP0223present
• Throttledemandtransientcondition
Malfunction Criteria 1:
• TPSerror>3%for7.5secs
Enable Criteria 2:
• Ignitionon
Disable Criteria 2:
• ElectronicthrottlefaultP2135,P0122,P0122,P0222orP0223present
Malfunction Criteria 2:
• Throttlenotabletofindclosedpositionduringboot
Potential failure modes:
• Blockedthrottlebody
• Damagetothrottleactuator
Diagnostic Mask:
• TheMILwillbeilluminatediffaultispresent.
Notes: A mechanically sprung 7% throttle opening may be imposed.
2009/02